Regenerate images in Book 1 chapters 11-12 as PNGs instead of JPGs wi…

…th artifacts (RayTracing#179).
aras-p · Sep 7, 2019 · ce9e24b · ce9e24b
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diff --git a/books/RayTracingInOneWeekend.html b/books/RayTracingInOneWeekend.html
@@ -1603,7 +1603,7 @@
 
 gives:
 
-  ![Image 11-1](../images/img-1-11-1.jpg)
+  ![Image 11-1](../images/img-1-11-1.png)
 
 </div>
 
@@ -1674,11 +1674,11 @@
 
 to get:
 
-  ![Image 11-2](../images/img-1-11-2.jpg)
+  ![Image 11-2](../images/img-1-11-2.png)
 
 And we can change field of view to get:
 
-  ![Image 11-3](../images/img-1-11-3.jpg)
+  ![Image 11-3](../images/img-1-11-3.png)
 
 </div>
 
@@ -1787,7 +1787,7 @@
 
 We get:
 
-  ![Image 12-1](../images/img-1-12-1.jpg)
+  ![Image 12-1](../images/img-1-12-1.png)
 
 </div>
 

diff --git a/images/img-1-11-1.jpg b/images/img-1-11-1.jpg
diff --git a/images/img-1-11-1.png b/images/img-1-11-1.png
diff --git a/images/img-1-11-2.jpg b/images/img-1-11-2.jpg
diff --git a/images/img-1-11-2.png b/images/img-1-11-2.png
diff --git a/images/img-1-11-3.jpg b/images/img-1-11-3.jpg
diff --git a/images/img-1-11-3.png b/images/img-1-11-3.png
diff --git a/images/img-1-12-1.jpg b/images/img-1-12-1.jpg
diff --git a/images/img-1-12-1.png b/images/img-1-12-1.png